The Force-A MULTIPLEX 330™ sensor is a portable fluorometer that allows exciting the fluorescence of molecules under UV, which were unattainable before. The fluorescent molecules, phytoalexins for instance, are measured in real-time and in a non-destructive way. The polyphenols are induces by the plant due to pathogen agents, making the Force-A MULTIPLEX 330™ sensor a field fluorometer for pathogen detection. A measurement with Multiplex takes less than a second by just pressing a button. The settings are easily configured through a user friendly interface on the touchscreen. The data is stored on a SD card and is also displayed on the LCD screen. The data can then be handled with the most common data presentation software. In its field portable version, Multiplex has a long life battery designed to keep measuring for an entire day and it can then be recharged in three hours.